rao, D. narayana, and P. M.Yohan. “HEAT TRANSFER ENHANCEMENT IN DOMESTIC REFRIGERATOR USING R600A/POLYESTER OIL/NANO-CuO AS WORKING FLUID”. International Journal of Technical Innovation in Modern Engineering & Science, vol. 3, no. 10, Nov. 2021, pp. 35-38, https://ijtimes.com/index.php/ijtimes/article/view/858.